Full Idea
If cause neither subsists before its effect, nor subsists along with it, nor does the effect precede the cause, it would seem that it has no substantial existence at all.
Gist of Idea
Cause can't exist before effect, or exist at the same time, so it doesn't exist
Source
Sextus Empiricus (Outlines of Pyrrhonism [c.180], III.27)
Book Reference
Sextus Empiricus: 'Outlines of Pyrrhonism', ed/tr. Bury,R.G. [Prometheus 1990], p.196